Fix keyboard search when left pane is narrow

This PR fixes Cmd+f/Ctrl+f functionality in the left pane.
Using a keyboard to search across all
conversations should now automatically change the left pane width
to accommodate the search input component.

Resolves: #6281

ts/state/selectors/search.ts

@@ -54,6 +54,23 @@ export const getIsSearchingInAConversation = createSelector(
   Boolean
 );
 
+export const getGlobalSearchValue = createSelector(
+  getSearch,
+  (state: SearchStateType): boolean | undefined => state.globalSearch
+);
+
+export const getIsSearchingGlobally = createSelector(
+  getGlobalSearchValue,
+  Boolean
+);
+
+export const getIsSearching = createSelector(
+  getIsSearchingInAConversation,
+  getIsSearchingGlobally,
+  (isSearchingInAConversation, isSearchingGlobally): boolean =>
+    isSearchingInAConversation || isSearchingGlobally
+);
+
 export const getSearchConversation = createSelector(
   getSearchConversationId,
   getConversationLookup,